
鸿蒙车载手机双屏导航系统开发指南 原创
鸿蒙车载手机双屏导航系统开发指南
一、系统架构设计
基于HarmonyOS的分布式能力,我们设计了一套车载与手机双屏协同导航系统,主要功能包括:
路线同步:通过@ohos.distributedLocation实现路线实时同步
任务分工:车载大屏显示导航主界面,手机作为路线规划与设置终端
交互协同:任一设备操作可实时反映到另一设备
硬件互补:车载GPS提供高精度定位,手机网络提供实时路况
!https://example.com/harmony-dual-nav-arch.png
二、核心代码实现
分布式位置服务封装
// DistributedLocationService.ets
import distributedLocation from ‘@ohos.distributedLocation’;
class DistributedLocationService {
private static instance: DistributedLocationService;
private locationManager: distributedLocation.LocationManager;
private constructor() {
this.locationManager = distributedLocation.createLocationManager();
this.setupListeners();
public static getInstance(): DistributedLocationService {
if (!DistributedLocationService.instance) {
DistributedLocationService.instance = new DistributedLocationService();
return DistributedLocationService.instance;
private setupListeners(): void {
this.locationManager.on('locationChange', (location) => {
this.handleLocationUpdate(location);
});
this.locationManager.on('routeSync', (data) => {
this.handleRouteSync(data);
});
public async startNavigation(route: NavigationRoute): Promise<void> {
await this.locationManager.startLocating({
priority: distributedLocation.LocationRequestPriority.FIRST_FIX,
scenario: distributedLocation.LocationRequestScenario.NAVIGATION
});
this.syncRoute(route);
// 其他方法…
export const locationService = DistributedLocationService.getInstance();
车载导航主界面
// CarNavigation.ets
@Component
export struct CarNavigation {
@State currentRoute: NavigationRoute | null = null;
build() {
Column() {
// 地图显示区域
MapComponent({ route: this.currentRoute })
.height(‘60%’)
// 导航信息区域
NavigationInfoPanel({ route: this.currentRoute })
.width('100%')
.onAppear(() => {
locationService.addSyncCallback(this.updateHandler);
})
private updateHandler = {
onLocationUpdate: (location) => this.updateNavigation(),
onRouteUpdate: (route) => this.currentRoute = route
};
手机端路线规划界面
// PhoneRoutePlanner.ets
@Component
export struct PhoneRoutePlanner {
@State routeOptions: RouteOption[] = [];
build() {
Column() {
// 地址输入区域
AddressInputPanel()
// 路线选项
RouteOptionsList({ options: this.routeOptions })
// 控制按钮
NavigationControls()
}
private calculateRoutes(): void {
// 计算并显示路线选项
}
分布式地图组件
// MapComponent.ets
@Component
export struct MapComponent {
@Link route: NavigationRoute;
build() {
Canvas($context)
.onReady(() => this.drawRoute())
.onRouteUpdate(() => this.drawRoute())
private drawRoute(): void {
// 绘制路线和当前位置
}
三、设备间交互控制
设备管理服务
// DeviceManagerService.ets
class DeviceManagerService {
private deviceManager: distributedDeviceManager.DeviceManager;
public async connectToDevice(deviceId: string): Promise<boolean> {
return await this.deviceManager.connectDevice(deviceId);
// 其他设备管理方法…
设备选择界面
// DeviceSelector.ets
@Component
export struct DeviceSelector {
@State availableDevices: DeviceInfo[] = [];
build() {
List({ space: 10 }) {
ForEach(this.availableDevices, (device) => {
DeviceItem({ device })
})
}
四、项目配置与权限
// module.json5
“requestPermissions”: [
“name”: “ohos.permission.ACCESS_DISTRIBUTED_LOCATION”,
"reason": "获取分布式位置信息"
},
“name”: “ohos.permission.LOCATION”,
"reason": "获取设备位置信息"
]
五、总结与扩展
本系统实现了以下核心功能:
跨设备实时导航同步
设备间高效协同工作
硬件资源最优利用
扩展方向:
实时路况集成
语音控制支持
AR导航功能
多车协同出行
通过HarmonyOS分布式能力,构建了无缝的车载-手机导航体验。
注意事项:
实际开发中需要处理设备连接状态变化
需要考虑不同设备的屏幕适配
生产环境需要添加错误处理机制
建议使用真机进行分布式功能测试
